I MOVED INTO A NEW HOUSE IN JAN THIS YEAR , INTENDED TO DO A FLUSH AND REFIL OF THE SYSTEM , THERE ARE NO PROBLEMS WITH IT AT THE MOMONT, A STICKER ON THE BOILER READS FERNOX MB10 COROSION PROFER NO REPLACEMENT NEEDED. IS THIS STUFF AS GOOD AS IT SAYS, I DONT KNOW WEN IS WAS PUT IN. CHEERS LEE

LEE, September 2006

its fernox MB1 inhibitor and yes if youv drained the system put some back in .it stops the build up of crap which will occur on an untreated system

Andy, October 2006